Browse Prior Art Database

REVERSAL LIQUID DEVELOPMENT OF ELECTROSTATIC LATENT IMAGES

IP.com Disclosure Number: IPCOM000023938D
Original Publication Date: 1979-Apr-30
Included in the Prior Art Database: 2004-Apr-01
Document File: 2 page(s) / 609K

Publishing Venue

Xerox Disclosure Journal

Abstract

Reversal imaging systems and techniques are generally described in U.S. Patent 3,712,728. The present disclosure relates to a reversal development of electro-static latent image in the liquid development process disclosed in U.S. Patent 3,084,043 generally referred to as polar liquid development. An electrostatic latent image is developed or made visible by presenting to the imaging surface a conductive liquid developer on the surface of a developer dispensing member having a plurality of raised portions or "lands" defining a substantially regular patterned surface and a plurality of portions depressed below the raised portions or "valleys". The depressed portions of the developer dispensing member contain a layer of conductive liquid developer which is maintained out of contact with the electrostatographic imaging surface. Development is achieved by moving the developer dispensing member loaded with liquid developer in the depressed portions adjacent the imaging. surface. The liquid developer is selectively attracted from the depressed portions of the applicator surface in areas where an electrostatic field exists. Thus, the depressed portions or "valleys" of the developer dispensing member are emptied or substantially emptied in the areas from which the electrostatic image attracts the liquid developer onto the photoreceptor or any equivalent interposing member, At the moment which the depressed portion or "valley" is emptied by attraction of the liquid developer onto the photoreceptor or interposer, the liquid developer remaining behind in the depressed portion or "valley" constitutes a reversal image. In accordance with the present disclosure, the liquid developer remaining in the depressed portions of the developer dispensing member is withdrawn to a second surface, such as copy paper, to produce a reversal image thereon,

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XEROX DISCLOSURE JOURNAL

REVERSAL LIQUID DEVELOPMENT OF Proposed Classification ELECTROSTATIC LATENT IMAGES U.S. CL 155/10
Harold E. Clark - Int, CL G03g 15/10

Reversal imaging systems and techniques are generally described in U.S. Patent 3,712,728. The present disclosure relates to a reversal development of electro~ static latent image in the liquid development process disclosed in U.S. Patent 3,084,043 generally referred to as polar liquid development. An electrostatic latent image is developed or made visible by presenting to the imaging surface a conductive liquid developer on the surface of a developer dispensing member having a plurality of raised portions or "lands" defining a substantially regular patterned surface and a plurality of portions depressed below the raised portions or "valleys". The depressed portions of the developer dispensing member contain a layer of conductive liquid developer which is maintained out of contact with the electrostatographic imaging surface. Development is achieved by moving the developer dispensing member loaded with liquid developer in the depressed portions adjacent the imaging. surface. The liquid developer is selectively attracted from the depressed portions of the applicator surface in areas where an electrostatic field exists. Thus, the depressed portions or "valleys" of the developer dispensing member are emptied or substantially emptied in the areas from which the electrostatic image attracts the liquid developer onto the photoreceptor or any equivalent interposing member, At the moment which the depressed portion or "valley" is emptied by attraction of the liquid developer onto the photoreceptor or interposer, the liquid developer remaining behind in the depressed portion or "valley" constitutes a reversal image. In accordance with the present disclosure, the liquid developer remaining in the depressed portions of the developer dispensing member is withdrawn to a second surface, such as copy paper, to produce a reversal image thereon,

The primary advantage of the present process is the possibility of delivering a greater amount of liquid developer to the second surface to produce an image of higher density than the density of the first or original image deposited upon the photoreceptor or interposer. Furthermore, paper stripping after development of the reversal image from the developer dispensing member can be more easily accomplished than paper stripping from a photoreceptor member,

In those embodiments wherein the developer dispensing member comprises a depressed portion or "valley", such as a groove or other continuous depression, the liquid developer representing the reversal image may not remain static in the groove or depression once the liquid developer in an adjacent length of the groove or depression has been removed. In those cases, the reversal process of the present disclosure is preferably carried out with a developer dispensing member having depressed portions in the...